pen2x said:
how come this wont become a province? i have two colonie's already?
they are both trading post? what should i do?
are you playing VIP - if so there are colonization bans that prevent nations from claiming colonies on a continent even if they buy existing buildings from other nations.
Russia for example can not claim Asian colonies until 1865 IIRC in VIP, so even though you have the buildings, you are blocked from claiming them.
Also, though I do not think this is the case here, if the provinces have a life rating below what you are allowed to colonize in, even if you buy claim building that exist you will not be able to claim the colony due to the low life ratings.
but in your case, if you are playing ViP, I think given that it is 1838 and Russia is blocked from colonizing Asia in VIP until the 1860s, that is what you are experiencing. Keep in mind that historically the claims of ownership to Sakhalin were not worked out between Japan and Russia until the early 1870s, so a colony block for Russia until the 1860s makes sense for keeping the historical development of Russia's expansion. Since you are playing an ahistorical route by trying to claim Sakhalin very early, you are coming up against game mechanics designed to preserve the overall historical environment in VIP.
Check your diplomacy screen, you will see the list of colony blocks that Russia has with itself in VIP and when they end.